From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753039AbaEONIR (ORCPT ); Thu, 15 May 2014 09:08:17 -0400 Received: from relay.parallels.com ([195.214.232.42]:37355 "EHLO relay.parallels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752469AbaEONIQ (ORCPT ); Thu, 15 May 2014 09:08:16 -0400 From: Vladimir Davydov To: Andrew Morton CC: , , Christoph Lameter , Pekka Enberg Subject: [PATCH -mm] slab: delete cache from list after __kmem_cache_shutdown succeeds Date: Thu, 15 May 2014 17:08:11 +0400 Message-ID: <1400159291-5330-1-git-send-email-vdavydov@parallels.com> X-Mailer: git-send-email 1.7.10.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.30.16.96] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, on kmem_cache_destroy we delete the cache from the slab_list before __kmem_cache_shutdown, inserting it back to the list on failure. Initially, this was done, because we could release the slab_mutex in __kmem_cache_shutdown to delete sysfs slub entry, but since commit 41a212859a4d ("slub: use sysfs'es release mechanism for kmem_cache") we remove sysfs entry later in kmem_cache_destroy after dropping the slab_mutex, so that no implementation of __kmem_cache_shutdown can ever release the lock. Therefore we can simplify the code a bit by moving list_del after __kmem_cache_shutdown. Signed-off-by: Vladimir Davydov Cc: Christoph Lameter Cc: Pekka Enberg --- mm/slab_common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index 48fafb61f35e..735e01a0db6f 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -346,15 +346,15 @@ void kmem_cache_destroy(struct kmem_cache *s) if (memcg_cleanup_cache_params(s) != 0) goto out_unlock; - list_del(&s->list); if (__kmem_cache_shutdown(s) != 0) { - list_add(&s->list, &slab_caches); printk(KERN_ERR "kmem_cache_destroy %s: " "Slab cache still has objects\n", s->name); dump_stack(); goto out_unlock; } + list_del(&s->list); + mutex_unlock(&slab_mutex); if (s->flags & SLAB_DESTROY_BY_RCU) rcu_barrier(); -- 1.7.10.4